Ni-Cr alloy for knife making, any ideas?

this kind of heavy deformation is very very hard if not impossible to be achieved for most civil using industry. if you really want to test out the hardness at 90% reduction with your aviliable equiptment, maybe try cold draw into wire. but a wire can't use as a knife blade.

however, cold roll into 3mm sheet is pretty easy to do for most people. and hardness can go up to 61hrc.
 
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Nebulae said:
Is there a data sheet available, there are just so many questions
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ok, i just found something can easily understant without need to bother reading chinese.

aging.png


red line is solution ->cold rolled from 5.2 to 3mm sheet ->630 C aging.

blue one is solution-> 5.2mm sheet without cold roll->630 C aging.

lol this picture will make it easier.
aging3.png
 
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here is another one.

age%202.png


hardness vs time.

red line is solution ->cold rolled 5.2mm to a 3mm sheet ->630 C aging.

blue one is solution->5.2mm sheet without cold roll ->630 C aging. same like picture above.
 
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wow this stuff may have serious potential. Good hardness (and probably wear resistance), excellent corrosion resistance, the only missing piece is toughness. This may be a winner, certainly for some applications. problem is probably going to be availability and cost. really cool though I like out of the box thinking. I am looking forward to seeing how this develops
 
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the toughness and resilience of the alloy is hard to be examined because of its unique characterisic. unlike hardness, wear resistance and corrossion resistance, the truth of toughness cannot be simple showed with an charpy test paper. its a much complicated field to study.

the direct unnotched and C-notched charpy test had showed the impact toughness is between DC53 and A2(above dc53, and a little lower than A2). which is pretty amazing. however futher test and caculating. showed me that the elasitcity taking major part in absorb the impact energy. plasitic deformation only absorbed very little part of the impact energy. meanwhile unpon heavy impact, the blade made of this alloy will flex as much as possible instead of bending, with a yeild strength up to 4600mpa(supperior than most of stainless steel). however once pass this limits, the range of plastic deformation is short compare to A2 and DC53.

one thing i must say and you MUST hear(for your own life matters)!!!! when you do the destructive test, do the bending at the last and with caution. it will be very very hard to bend, and will be very elastic and flexable. stronger than most of the ferrous alloy. but once you pass the limit, it will bend very littile before crack or chipping. for example, you can flex the 70cm blade over 160° without bending it, but when you pass the 160° it might cause direct cracking and chipping. most ferrous alloy when pass the yeild strength limit, the plastic deformation will occure before cracking. unlike the ferrous, this alloy offers supperior yeild strength and flexability, but once the working stress is beyond its limit, there will be very little plasticity buffering the bending stress. cracking and chipping will be very likly the result. in this case over 4600mpa yeild stress has possiblity of sudden turning into kenitic energy. so for your safty stay behind a board at least when you try break or crack it.

soviet russian used it for their largest submarines operating uner 3300 feet below water level. this alloy has to take that huge amount of pressure in additional of working stress of the main propeller. but the more it takes, the harder when it falls. just be very very very careful when you do the destructive bending, wear a helment to protect your eye and neck at least. i just don't want anyone injure themself because of this.
 
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This alloy is used for I stumbled on the knife.
It was originally developed in the bearing or shaft with a tip, but also strange that this material was originally the sixties of last century's technology, but do not know why it has not been a lot of production.
Personally I feel it is extremely difficult under high temperature forging, and finished product rate is very low.
Perhaps the reason is its high cost due to the reason for not universal.
 
I am currently in effect, the use, in addition to the blade is not easy to open to a very sharp edge, really did not find it for the tool has obvious shortcomings.
Very wonderful!
 
yangguangzhu said:
I am currently in effect, the use, in addition to the blade is not easy to open to a very sharp edge, really did not find it for the tool has obvious shortcomings.
Very wonderful!
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Are you saying:
"It is hard to sharpen, but has no other shortcomings."
 
From what I read I believe this aloy is the next generation in the super stainless steel family. I' afraid it will be something very exotic and expensive for the average user collector, for the EDC user forget it. But there is some hope. Once you had to sell your house to buy a computer and now we have disposabe cell phones. I mean is as time and the tech knowledge of this alloy in the process of blade making progresses there might be some price reduction and might be available at a price that most will concider reachable and thus we might have a chance to expore it's exoticness
 
Generally, a material particularly if a good case, there will always be some corresponding weaknesses. But frankly, this material so far I really have not found particularly bad place.
Moreover, this material is also some very special place, say, polishing with sandpaper, I feel very easy, but when hacking wooden, but very good retention.
 
i believe the key to solve the price problem is to increasing the finished production rate. right now this rate is very low, barely 50%. and it required very precisely crotrolled forging progress.

if this can be solved, then the price problem will be no more.
 
The wear resistance than stellite alloy, from about my personal feelings kike v4. I think that is enough, is also very good, after all, the hardness can be 58 and toughness very good.
 
the patents tricks are are well played and funny.

russian and US military was using this type alloy since 1960s. and the using history of this alloy are over half century in more than at least 4 countries.

the free sample of GNiCr40Al4 shipped to every testers was putted into civil industry using in china since 1970s, used as virbration proof wear resistance axle centre alloy. it was listed into china's national standrad YB／T5243一1993 since 1993. this group of alloy was PROUDLY INVENTED　ＢＹ AMERICAN　ＥＮＧＩＮＥＥＲＳ at 1960s, and was improved by soviet military. and now it was fully manufacture in china. by all means, this specific alloy and its whole family are definitely not of any sort of toshiba invention. all i can say is that toshiba patent is a well played trick, nothing more.

anyway, i just had time readed the whole toshiba's claims. and funny thing is that the claim number 4, that had made GNiCr40Al4 alloy out of their claim.
 
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Hi Hammerfall - I was wondering if you had a chance to get us any data sheets or research papers on this product.
 
AcridSaint said:
Hi Hammerfall - I was wondering if you had a chance to get us any data sheets or research papers on this product.
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sure thing, my user limits are not allow me to uploading files. if you can leave me your contact info, i will send the pfd file to you. the papper i have are in chinese and russian. right now i only have the chinese one. its too hard for me to translate whole papper into english. if you live near any university,you might able to translante it into english.
 
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